As the error message states an OBJECT library can't consume other OBJECT libraries. When creating the actual library you will have to explicitly state what $<TARGET_OBJECTS:?> you need.
If you are just looking at a way to simplify the logic for the consuming library you should look at doing the following: 1. Use a global property to store what OBJECT targets should be consumed 2. Wait for https://gitlab.kitware.com/cmake/cmake/merge_requests/1524 to be finished. On Fri, Feb 16, 2018 at 12:29 PM, Simone Atzeni <satz...@nvidia.com> wrote: > Hi, > > > > I am trying to merge together two “OBJECT” libraries. > > I am following the tutorial at: > https://cmake.org/Wiki/CMake/Tutorials/Object_Library > > > > However, in my case I have more level of folder nesting, and at the parent > level I would like to merge two “OBJECT” libraries and only at the top I > want to create the actual library. > > > > I tried with: > > > > add_library(common OBJECT "$<TARGET_OBJECTS:A> $<TARGET_OBJECTS:B> > $<TARGET_OBJECTS:C>") > > > > But I get the following error: > > > > ----------------------------------------------------------------------------------------------------- > > CMake Error at lib/common/CMakeLists.txt:31 (add_library): > > OBJECT library "common" contains: > > > > file1.cpp.o > > file2.cpp.o > > file3.cpp.o > > … > > > > but may contain only sources that compile, header files, and other files > > that would not affect linking of a normal library. > > > > CMake Error at lib/common/CMakeLists.txt:31 (add_library): > > Only executables and non-OBJECT libraries may reference target objects. > > > > What’s the correct way to do this? > > > > Thanks. > > Simone > > > > ________________________________ > This email message is for the sole use of the intended recipient(s) and may > contain confidential information. Any unauthorized review, use, disclosure > or distribution is prohibited. If you are not the intended recipient, > please contact the sender by reply email and destroy all copies of the > original message. > ________________________________ > > -- > > Powered by www.kitware.com > > Please keep messages on-topic and check the CMake FAQ at: > http://www.cmake.org/Wiki/CMake_FAQ > > Kitware offers various services to support the CMake community. For more > information on each offering, please visit: > > CMake Support: http://cmake.org/cmake/help/support.html > CMake Consulting: http://cmake.org/cmake/help/consulting.html > CMake Training Courses: http://cmake.org/cmake/help/training.html > > Visit other Kitware open-source projects at > http://www.kitware.com/opensource/opensource.html > > Follow this link to subscribe/unsubscribe: > https://cmake.org/mailman/listinfo/cmake > -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: https://cmake.org/mailman/listinfo/cmake
